SSCE VCE Chemistry Practical Work: A senior Chemistry student bough

Question

A senior Chemistry student bought a packet of Krispy Krackers from the local farmers’ market. The label on the packet had no information on the energy content of the biscuits.

The student decided that he would measure the energy content of a Krispy Krackers biscuit by burning it under a can of water and measuring the temperature rise of the water.

Having performed a similar experiment in the past, he knew that when the biscuit was burnt, heat energy would be lost to the environment. To increase the accuracy of the result, the canister was first burnt and the temperature rise of the water from that measured. Then he repeated by burning butane gas and the percentage energy loss using the equipment could be determined to find the result for the biscuit.

The experimental set-up and the results for Part 1 of the experiment are shown below.

Part 1 – The heat content of butane.
1. Measure the initial mass of a butane canister.
2. Measure the mass of a metal can, add 250 mL of water and re-weigh.
3. Set up the apparatus as in the diagram and measure the initial temperature of the water.
4. Burn the butane gas for five minutes.
5. Immediately measure the final temperature of the water.
6. Measure the final mass of the butane canister when cool.

A senior Chemistry student bought a packet of Krispy Krackers from the local farmers’ market - VCE - SSCE Chemistry - Question 10 - 2016 - Paper 1

Worked Solution & Example Answer:A senior Chemistry student bought a packet of Krispy Krackers from the local farmers’ market - VCE - SSCE Chemistry - Question 10 - 2016 - Paper 1

1. Measure the initial mass of a butane canister.

2. Measure the mass of a metal can, add 250 mL of water and re-weigh.

3. Set up the apparatus and measure the initial temperature of the water.

4. Burn the butane gas for five minutes.

5. Immediately measure the final temperature of the water.

6. Measure the final mass of the butane canister when cool.

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